Measuring method of oil drop size

Abstract

The invention relates to a measuring method of oil drop sizes. The measuring method comprises the steps: manufacturing a two-phase flow fluid sampler, wherein a middle sampling shooting section is shaped like flat cuboid space and is made of transparent materials; connecting both ends of the two-phase flow fluid sampler to a to-be-measured pipeline by flanges, and arranging a high-speed camera lens opposite to two-dimensional surfaces formed by long edges and wide edges of the sampler, so as to shoot fluid in the sampler when oil-water two-phase flow flows across the middle sampling shooting section of the sampler; extracting oil drop edges by utilizing a multi-scale edge detection algorithm; processing the extracted edges and dividing the extracted edges into oil drop adhering images and oil drop non-adhering images; dividing the oil drop adhering images by utilizing a watershed algorithm, and then performing circle fitting operation; directly performing circle fitting operation on the oil drop non-adhering image; integrating two fitting results, so as to obtain an oil drop edge extraction result chart; and calculating the diameter D of each oil drop. By using the measuring method of the oil drop sizes, which is provided by the invention, the size of each oil drop can be accurately measured on the basis of obtaining a high-definition oil-water two-phase flow image.

Description

Technical field [0001] The invention relates to a method for measuring the size of oil droplets. Background technique [0002] Most of the reservoirs in China's oilfields are continental clastic rock deposits, and the heterogeneity of the reservoirs is much more complicated than that of overseas marine sedimentary-dominated reservoirs. Judging from the status of newly developed oilfields, the grade of newly proven reserves has decreased, and the reserves of low-permeability and ultra-low-permeability oilfields account for a relatively large proportion. Judging from the status quo of the developed oilfields, they have generally entered the stage of high water cut and high recovery degree. Most of the main old oilfields have entered or approached the late development stage of ultra-high water cut, and their oil wells are particularly characterized by low permeability, low production and high water cut production. [0003] Under the conditions of low-permeability and low-yield...

AI Technical Summary

Problems solved by technology

However, due to the random movement of scattered oil droplets in a circular pipe, if a high-speed camera is directly used to take pictures of the fluid in the pipe, the resulting picture will be distorted due to the overlapping of oil droplets, the oil-water phase, and the refraction of light at the pipe wall, resulting in oil-water two-phase flow Massive loss of microfluid structure information

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